ROM Upgrade freezing at 11%

[nvr8nf]

Let me start by saying I am way over my head here!

I bought a 6800 on ebay that was suppose to be new. Says Alltel on the box and Alltel when the phone boots. Long story short the security code was not a Alltel code but a Sprint code. And the internet settings were set for sprint as well.

We got the phone to work but it wouldn't connect to the internet. So, I called HTC direct and they had me check the current ROM and they said it was Alltel. Weird. So, they told me to download and install the most recent ROM update. They had me hold the power and camera button down while hitting reset to put it in the right mode, which made the screen red, green, blue and white. The install gets to 11% and I get a "ERROR [290] : INVALID COMMAND" error every single time.

I have tried it on both my Vista and XP computer and at 11% it freezes. Now my phone won't work at all, just the multi-colored screen.

Like I said I know nothing about this phone and I'm in over my head so i came here looking for suggestions.